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A lens mount is an interface, mechanical and often also electrical, between a photographic camera body and a lens. It is confined to cameras where the body allows interchangeable lenses.

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What type of lens mount is this Som Berthiot?

I bought this som berthiot 20mm f1.9 lens assuming it was a c-mount but it is much smaller with an elongated screw mount. Can't figure out what type of mount this could be. Here it is compared to ...